6686666866 has 32 divisors (see below), whose sum is σ = 11128608000. Its totient is φ = 2987701200.

The previous prime is 6686666843. The next prime is 6686666879.

6686666866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6686666798 and 6686666807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730981 + ... + 740071.

It is an arithmetic number, because the mean of its divisors is an integer number (347769000).

Almost surely, 2^6686666866 is an apocalyptic number.

6686666866 is a deficient number, since it is larger than the sum of its proper divisors (4441941134).

6686666866 is a wasteful number, since it uses less digits than its factorization.

6686666866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9670.

The product of its digits is 107495424, while the sum is 64.

The square root of 6686666866 is about 81772.0420804079. The cubic root of 6686666866 is about 1883.9522695989.

The spelling of 6686666866 in words is "six billion, six hundred eighty-six million, six hundred sixty-six thousand, eight hundred sixty-six".